#include <rtthread.h>
#include <rtdevice.h>
#include "drv_common.h"
#include <dfs_posix.h>

#define SAMPLE_UART_NAME       "uart5"


static int fd = -1;

/* 用于接收消息的信号量 */
static struct rt_semaphore rx_sem;
static rt_device_t serial;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;  /* 初始化配置参数 */

/* 接收数据回调函数 */
static rt_err_t uart_input(rt_device_t dev, rt_size_t size)
{
    /* 串口接收到数据后产生中断，调用此回调函数，然后发送接收信号量 */
    rt_sem_release(&rx_sem);

    return RT_EOK;
}

static void serial_thread_entry(void *parameter)
{
    char ch;
    //char str[] = "hello\r\n";

    while (1)
    {
        /* 从串口读取一个字节的数据，没有读取到则等待接收信号量 */
        while (rt_device_read(serial, -1, &ch, 1) != 1)
        {
            /* 阻塞等待接收信号量，等到信号量后再次读取数据 */
            rt_sem_take(&rx_sem, RT_WAITING_FOREVER);
        }
        /* 读取到的数据通过串口错位输出 */
        ch = ch + 2;
        rt_device_write(serial, 0, &ch, 1);
//        rt_device_write(serial, 0, str, (sizeof(str) - 1));
//        rt_thread_mdelay(200);

//        if (fd < 0)
//        {
//            fd = open("/text.txt", O_WRONLY | O_CREAT | O_APPEND);
//        }
//
//        if (fd >= 0)
//        {
//            write(fd, &ch, 1);
//            fsync(fd);
//            rt_kprintf("Write done.\n");
//        }



    }
}




int uart_sample()
{


    rt_kprintf("uart_samle");
    rt_err_t ret = RT_EOK;
    char uart_name[RT_NAME_MAX];
    char str[] = "hello RT-Thread!\r\n";

//    if (argc == 2)
//    {
//        rt_strncpy(uart_name, argv[1], RT_NAME_MAX);
//    }
//    else
//    {
//        rt_strncpy(uart_name, SAMPLE_UART_NAME, RT_NAME_MAX);
//    }

    rt_strncpy(uart_name, SAMPLE_UART_NAME, RT_NAME_MAX);

    /* step1：查找串口设备 */
    serial = rt_device_find(uart_name);

    if (RT_NULL == serial)
    {
        rt_kprintf("open serial faile");
    }
    else {
        rt_kprintf("open serial ok\r\n");
    }

    /* step2：修改串口配置参数 */
    config.baud_rate = BAUD_RATE_115200;      //修改波特率为 9600
    config.data_bits = DATA_BITS_8;           //数据位 8
    config.stop_bits = STOP_BITS_1;           //停止位 1
    config.rx_bufsz  = 128;                   //修改缓冲区 buff size 为 128
    config.parity    = PARITY_NONE;           //无奇偶校验位

    /* step3：控制串口设备。通过控制接口传入命令控制字，与控制参数 */
    rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, &config);

    /* 初始化信号量 */
    rt_sem_init(&rx_sem, "rx_sem", 0, RT_IPC_FLAG_FIFO);
    /* 以中断接收及轮询发送模式打开串口设备 */
    rt_device_open(serial, RT_DEVICE_FLAG_TX_BLOCKING|RT_DEVICE_FLAG_RX_NON_BLOCKING);
    /* 设置接收回调函数 */
    rt_device_set_rx_indicate(serial, uart_input);
    /* 发送字符串 */
    rt_device_write(serial, 0, str, (sizeof(str) - 1));

    /* 创建 serial 线程 */
    rt_thread_t thread = rt_thread_create("serial", serial_thread_entry, RT_NULL, 1024, 25, 10);
    /* 创建成功则启动线程 */
    if (thread != RT_NULL)
    {
        rt_kprintf("start serial thread ok\r\n");
        rt_thread_startup(thread);
    }
    else
    {
        rt_kprintf("start serial thread failed");
        ret = RT_ERROR;
    }


    return ret;
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(uart_sample, uart device sample);

